What's on the label is the measured result — net peptide mass, not gross powder weight, plus RP-HPLC purity, on a lot-numbered COA for every batch.
Net peptide mass and RP-HPLC purity — a lot-numbered COA for every batch.
Net peptide mass + HPLC purity, per lot.
PCAC will review 7 peptides for the 503A bulks list, BPC-157, KPV, TB-500, MOTS-c, Emideltide, Semax, Epitalon. Read our briefing →
PCAC will review 7 peptides for the 503A bulks list. Read →
FDA PCAC reviews 7 peptides in July. Read →
Preservative-free sterile water reconstitution diluent
PeptideXpo buyer fit
This PeptideXpo page is intentionally positioned for distributors, OEM buyers, and procurement teams comparing Sterile Water for Injection inside a wider peptide catalog. It is not trying to be the deepest single-molecule monograph; the differentiated intent is assortment planning, export-ready documentation, fill-size comparison, and whether this SKU belongs in a broader buyer program.
Overview
Sterile Water for Injection (SWFI) is the preservative-free single-use reconstitution diluent for peptide and other injectable preparations. The absence of any preservative, distinguishing SWFI from Bacteriostatic Water, makes it the appropriate diluent for two main use cases: (1) preparations intended for single-use within a short window after reconstitution, where multi-use preservation is unnecessary, and (2) peptides where benzyl alcohol or other preservatives are incompatible with the peptide chemistry or downstream application. SWFI is also the recommended diluent for any sterile-filled finished product where the preservation system is built into the formulation rather than the diluent. PeptideXpo supplies SWFI in 3 ml and 10 ml sterile vial formats. The release packet documents sterility, bacterial endotoxin (LAL), and pH per pharmacopeia standards. Buyers should match the diluent to the peptide stability profile: peptides requiring acidic pH should use the 0.6% Acetic Acid Water diluent; preservative-incompatible peptides should use SWFI in single-use preparations; preservative-compatible peptides intended for multi-use can use BAC Water.
Who buys this, and why
Custom-blend buyers are almost always OEM clients building a branded product around a specific ratio of two or more peptides. The development workflow is collaborative: ratio target, analytical method to verify it, stability protocol in the chosen carrier, and packaging selection are all defined in the OEM brief before the first commercial run. Sample-stage volumes are usually 5-10 g of finished blend; commercial MOQ depends on the components.
Primary buyer fit: 503A / 503B compounding pharmacies, academic and contract research laboratories, and regional distributors and re-sellers.
Specifications
Documentation available on request
Regulatory note
Preservative-free reconstitution diluent for single-use preparations. Verify sterility, pyrogen (LAL), and injectable-grade compliance with target market regulations.
Frequently asked questions
Benzyl alcohol (the 0.9% preservative in BAC Water) interacts with some short peptides through hydrophobic association at the peptide surface, which can produce: (1) shifts in peptide solubility, (2) accelerated aggregation in some cases, and (3) interference with downstream cell-based assays for benzyl-alcohol-sensitive systems. Preservative-free SWFI eliminates this concern entirely, at the trade-off that the reconstituted vial must be used within a short window (typically 24 hours at refrigerated temperature, or single-use immediately) because no preservative prevents microbial growth after septum puncture. For most peptides where benzyl alcohol compatibility is documented, BAC Water is the operationally simpler choice; for new or untested peptides, SWFI is the conservative default.
USP-grade Water for Injection is produced through distillation or equivalent purification (reverse osmosis with UF and final-step distillation) from potable feedwater, designed to meet strict specifications for total organic carbon, conductivity, microbial limits, and bacterial endotoxin (typically <0.25 EU/mL). After production, the water is sterilized by autoclave or terminal sterile-filtration and filled into sterile vials under controlled cleanroom conditions. The 28-day expiry on opened SWFI vials reflects the absence of preservative, once the rubber septum is pierced, microbial ingress from the air or repeated needle introduction becomes the limiting factor. PeptideXpo's SWFI is supplied to USP <1231> Water for Injection monograph specifications; international pharmacopeia equivalents (EP, BP, JP) are available on request.
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